It could be a host of problems, is it lifted? Tell us the specs, and fill out your bio, but off the top of my head i'll say its probably lifted and you're getting a slip yoke bind and clunk, try lubing the rear drive shaft slip yoke. but thats just a guess without any info on your truck.

Skyler is in the process of selling out to a larger company. They told me they should hopefully be up and running again by mid summer, I am in the process of trying to get a more exact date from them but so far have gotten no responce.I think i am going to wait becuase i am verry impressed with the quality and design of their tops, but I dont want to wait to long, so if they are going to take forever, i will just have to get one custom made.
Ike

Useful Searches

>
About Us>
>
In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. Since then it has grown to be
a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. CK5 has since expanded
to include the C/K series GM Truck and Suburban as well as past and present GM models.
>>
With its technical articles, factory specifications, photo gallery, classifieds, active message forum, product
reviews and original automotive content it's an unbeatable source.